.pk-sidebar {
  height: 100%; /* full-height: remove this if you want "auto" height */
  width: 200px; /* width of the sidebar */
  position: fixed; /* fixed Sidebar (stay in place on scroll) */
  z-index: 1; /* stay on top */
  top: 0; /* stay at the top */
  left: 0;
  background-color: #eee;
  overflow-x: hidden; /* disable horizontal scroll */
  padding-top: 80px;
}

.pk-sidebar a {
  padding-left: 6px;
}

#grp-content-container, #grp-content-title, .grp-messagelist {
  margin-left: 200px; /* same as the width of the sidebar */
}